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问题 单项选择题

肝内有三条韧带对超声检查很重要，它们是圆韧带、静脉韧带和镰状韧带。下列描述圆韧带正确的是（）。

①存在于左叶间裂；

②脐静脉的残留；

③在严重肝硬化时可见再通；

④在横切面上是一个回声增强光点；

⑤常见在门静脉之上。

A.①②

B.①②③

C.①②③⑤

D.①②④⑤

E.①②③④⑤

答案

参考答案：E

解析：所 * * 条均符合圆韧带的特点。

单项选择题

In one sense, we can trace all the problems of the American city back (91) a single starting point: we Americans don’t like our cities very much.
That is, on the (92) of it, absurd. After all, more than three-fourths of us now live in cities, and more are (93) to them every year. We are told that the problems of our cities are (94) more attention in Washington, and scholarship has discovered a whole new (95) in urban studies.
(96) , it is historically true: in the American psychology, the city has been a basically suspect institution, (97) with the corruption of Europe, totally lacking that sense of spaciousness and innocence of the (98) and the rural landscape.
I don’t pretend to be a scholar on the history of the city in American life. But my thirteen years in public (99) , first as an officer of the U. S. Department of Justice, then as Congressman, and now as Mayor of the biggest city in America have taught me (100) too well the fact that a p antiurban attitude (101) consistently through the mainstream of American thinking. Much of the (102) behind the settlement of America was in reaction (103) the conditions in European industrial centers and much of the theory (104) the basis of freedom in America was linked directly to the availability of land and the perfectibility of man outside the corrupt influences of the city.
What has this to do with the predicament of the modern city I think it has (105) to do with it. For the fact is that the United States (106) the federal government, which has historically established our national priorities, has simply never thought that the American city was "worthy" of (107) —at least not to the (108) of expending any basic resources on it.
Antipathy to the city predates the American experience. When industrialization (109) the European working man into the major cities of the continent, books and pamphlets appeared (110) the city as a source of crime, corruption, filth, disease, vice, licentiousness, subversion, and high prices.

A．frontier

B．border

C．outskirts

D．suburbs
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单项选择题

下列关于线程的叙述中，正确的是( )。

A．线程包含CPU现场，可以独立执行程序
B．每个线程有自己独立的地址空间
C．进程只能包含一个线程
D．线程之间的通信必须使用系统调用函数
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